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Entity integrity

Entity integrity is concerned with ensuring that each row of a table has a unique and non-null primary key value; this is the same as saying that each row in a table represents a single instance of the entity type modelled by the table. A requirement of E. F. Codd in his seminal paper is that a primary key of an entity, or any part of it, can never take…

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Overview

RelationTablePrimary keyRowAttributes
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Overview

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Map overview Semantic statistics

Entity integrity

Nodes13
Edges12
Triples0
Avg. degree1.85
Density0.153846
Components1

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Important terminology

key pk primary row value null table relation attributes entity unique part every must abbreviated fk also sql integrity data

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc

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